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JP5194637B2 - End mill - Google Patents

End mill Download PDF

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Publication number
JP5194637B2
JP5194637B2 JP2007214698A JP2007214698A JP5194637B2 JP 5194637 B2 JP5194637 B2 JP 5194637B2 JP 2007214698 A JP2007214698 A JP 2007214698A JP 2007214698 A JP2007214698 A JP 2007214698A JP 5194637 B2 JP5194637 B2 JP 5194637B2
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Prior art keywords
end mill
cutting edge
cutting
honing
rotation direction
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JP2009045704A (en
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崇志 三木
優次 高木
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Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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Priority to JP2007214698A priority Critical patent/JP5194637B2/en
Priority to KR1020107002096A priority patent/KR101351128B1/en
Priority to CN200880103604.1A priority patent/CN101784355B/en
Priority to US12/672,921 priority patent/US8690493B2/en
Priority to PCT/JP2008/064438 priority patent/WO2009025197A1/en
Priority to EP08827621.7A priority patent/EP2181787B1/en
Publication of JP2009045704A publication Critical patent/JP2009045704A/en
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Publication of JP5194637B2 publication Critical patent/JP5194637B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C5/00Milling-cutters
    • B23C5/02Milling-cutters characterised by the shape of the cutter
    • B23C5/10Shank-type cutters, i.e. with an integral shaft
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B24B3/06Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters of face or end milling cutters or cutter heads, e.g. of shank type
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00Cutters, for shaping
    • Y10T407/19Rotary cutting tool
    • Y10T407/1946Face or end mill
    • Y10T407/1948Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00Cutters, for shaping
    • Y10T407/19Rotary cutting tool
    • Y10T407/1952Having peripherally spaced teeth
    • Y10T407/1962Specified tooth shape or spacing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

本発明は、軸線回りに回転されるエンドミル本体の先端部外周に複数の切屑排出溝が形成され、この切屑排出溝のエンドミル回転方向前方側を向く壁面の外周側辺稜部に切刃が形成されたエンドミルに関する。   In the present invention, a plurality of chip discharge grooves are formed on the outer periphery of the tip end portion of the end mill body rotated around the axis, and a cutting blade is formed on the outer peripheral side ridge portion of the wall surface facing the front side in the end mill rotation direction of the chip discharge grooves. Related to end mills.

従来、例えば金型の切削加工などに用いられるエンドミルは、超硬合金などの硬質材料で円柱棒状に形成されたエンドミル本体からなり、エンドミル本体には、軸線方向後端側に設けられ、例えば工作機械のチャックなどに把持されるシャンク部と、シャンク部よりも軸線方向先端側に設けられ被削材の切削を行う切刃を備えた切刃部とが具備されている。このようなエンドミルは、切刃部の外周に、先端から後端側に向け、軸線回りに捩れる複数の切屑排出溝が形成され、これら切屑排出溝のエンドミル回転方向前方側を向く壁面と、径方向外側を向く外周面との交差稜線部(外周側辺稜部)に外周切刃(切刃)が形成されている。また、切屑排出溝のエンドミル回転方向前方側を向く壁面と、エンドミル本体の先端面との交差稜線部には、底切刃が形成されている。   2. Description of the Related Art Conventionally, an end mill used for, for example, die cutting or the like is composed of an end mill body formed in a cylindrical bar shape with a hard material such as cemented carbide, and the end mill body is provided on the rear end side in the axial direction. A shank portion that is gripped by a machine chuck or the like, and a cutting edge portion that is provided on the distal end side in the axial direction with respect to the shank portion and includes a cutting edge that cuts the work material. Such an end mill has a plurality of chip discharge grooves that are twisted around the axis from the front end toward the rear end side on the outer periphery of the cutting edge portion, and a wall surface facing the front side in the end mill rotation direction of these chip discharge grooves, An outer peripheral cutting edge (cutting edge) is formed at an intersecting ridge line portion (outer peripheral side ridge portion) with the outer peripheral surface facing radially outward. Moreover, the bottom cutting edge is formed in the intersection ridgeline part of the wall surface which faces the end mill rotation direction front side of a chip discharge groove | channel, and the front end surface of an end mill main body.

そして、上記のようなエンドミルは、エンドミル本体の後端側のシャンク部が工作機械のチャックに片持ち状態で保持されつつ軸線回りに高速回転されて、軸線に交差する方向に送り出しながら切刃部の外周切刃を被削材に切り込ませて使用される。   The end mill as described above has a shank portion on the rear end side of the end mill body that is held in a cantilevered state on the chuck of the machine tool and is rotated at a high speed around the axis, while being fed in a direction intersecting the axis, The outer peripheral cutting edge is cut into the work material and used.

このエンドミルの長寿命化及び切削性の向上を図る上では、該切刃の耐欠損性を高めることが重要な要素である。しかしながら、切刃が被削材に対して鋭利過ぎる場合には、該切刃に切削抵抗が集中して欠損が生じることがあり、このように欠損が生じた状態で切削を続けた場合、切削性が著しく損なわれてしまうという問題があった。そこで、例えば特許文献1又は特許文献2に記載のエンドミルでは、切刃に沿って直面状又は曲面状のホーニングが施されることによって、耐欠損性の向上が図られている。
特公平4−40122号公報 特開2000−52128号公報
In order to extend the life of the end mill and improve the machinability, it is important to increase the chipping resistance of the cutting blade. However, when the cutting edge is too sharp with respect to the work material, the cutting resistance may concentrate on the cutting edge and a defect may be generated. There was a problem that the property was significantly impaired. Thus, for example, in the end mill described in Patent Document 1 or Patent Document 2, the fracture resistance is improved by performing honing in a face shape or a curved surface along the cutting edge.
Japanese Examined Patent Publication No. 4-40122 JP 2000-52128 A

ところで、上記のようにエンドミルの切刃にホーニングを施した場合には、耐欠損性を向上させることで、該エンドミルの長寿命化及び切削性の向上を図ることができるものの、切刃自体の鋭利さが低下することから切れ味が悪くなり、被削材にバリが生じて仕上げ面が不良となる他、このバリを除去する工程が必要になる等、加工コストが高騰するおそれがあった。   By the way, when honing is performed on the cutting edge of the end mill as described above, it is possible to increase the life of the end mill and improve the machinability by improving the fracture resistance. Since the sharpness is lowered, the sharpness is deteriorated, the burrs are generated in the work material, the finished surface becomes defective, and a process for removing the burrs is required, which may increase the processing cost.

この発明はこのような課題に鑑みてなされたものであり、切刃の耐欠損性を向上させて長寿命化を図ることができるとともに、被削材にバリが発生するのを防止して良好な切削を行うことができるエンドミルを提供することを目的とする。   The present invention has been made in view of such a problem, and can improve the chipping resistance of the cutting edge to extend the life, and can prevent the occurrence of burrs in the work material. An object of the present invention is to provide an end mill capable of performing various cutting operations.

前記課題を解決するため、この発明は以下の手段を提案している。
即ち、本発明に係るエンドミルは、軸線回りに回転されるエンドミル本体の先端部外周に、前記軸線回りに捩れた螺旋状の切屑排出溝が複数形成され、これらの切屑排出溝のエンドミル回転方向前方側を向く壁面の外周側辺稜部に切刃が形成されたソリッドタイプのエンドミルにおいて、前記切刃に円弧状のホーニングが施され、それぞれの前記切刃におけるホーニングの円弧の曲率半径が、軸線方向で変化しており、前記切刃におけるホーニングの円弧の曲率半径が、エンドミル回転方向前方側からエンドミル回転方向後方側に向かって小さくなることを特徴としている。
In order to solve the above problems, the present invention proposes the following means.
That is, in the end mill according to the present invention, a plurality of spiral chip discharge grooves twisted around the axis are formed on the outer periphery of the end portion of the end mill main body rotated about the axis, and these chip discharge grooves are forward in the end mill rotation direction. In a solid type end mill in which a cutting edge is formed on the outer peripheral side ridge portion of the wall surface facing the side, the cutting blade is subjected to arc-shaped honing, and the radius of curvature of the honing arc in each cutting edge is an axis The radius of curvature of the arc of honing at the cutting edge decreases from the front side in the end mill rotation direction toward the rear side in the end mill rotation direction.

即ち、このような構成のエンドミルでは、切刃におけるホーニングの円弧の曲率半径が大きい箇所では耐欠損性が向上されて大きな切削抵抗にも耐えることができ、ホーニングの円弧の曲率半径が小さい箇所では刃先の鋭利さが維持されて切れ味が高いものとなっている。従って、切削状況に応じてエンドミルの切刃のホーニングの円弧の曲率半径を軸線方向で変化させ、例えば、欠損し易い箇所においては切刃のホーニングの円弧の曲率半径を増加させ、その他の箇所においてはホーニングの円弧の曲率半径を減少させることによって、切刃の寿命を延ばしつつ切れ味を維持してバリの発生を防止することが可能となる。 That is, in the end mill having such a configuration, the fracture resistance is improved at a portion where the radius of curvature of the honing arc at the cutting edge is large, and it can withstand a large cutting resistance, and at the portion where the radius of curvature of the honing arc is small. The sharpness of the cutting edge is maintained and the sharpness is high. Therefore, the radius of curvature of the honing arc of the cutting edge of the end mill is changed in the axial direction according to the cutting condition, for example, the radius of curvature of the honing arc of the cutting edge is increased in a portion that is likely to be chipped , and in other locations. By reducing the radius of curvature of the honing arc, it becomes possible to maintain the sharpness and prevent the occurrence of burrs while extending the life of the cutting edge.

エンドミルが軸線に交差する方向に送り出されながら被削物に切削加工を施す際には、エンドミルの先端部外周に切屑排出溝とともに螺旋状に設けられた切刃のうち、エンドミル回転方向前方側に位置する部分が最初に被削材に喰い付く。そのため、この部分は喰い付きの衝撃によって欠損しやすくなるが、本発明のエンドミルにおいては、切刃のエンドミル回転方向前方側の部分のホーニングの円弧の曲率半径が最も大きくされ、エンドミル回転方向後方側に向かってホーニングの円弧の曲率半径が小さくなるように構成されているため、最も欠損しやすい部分の耐欠損性を向上させつつ、その他の部分では切れ味を維持することができる。従って、切刃の寿命を延ばしながらバリの発生を防止することができる。
また、前記軸線方向の後端部の切刃にはホーニングが施されていなくてもよい。
When cutting the work piece while the end mill is fed in the direction crossing the axis, among the cutting blades spirally provided with the chip discharge groove on the outer periphery of the end part of the end mill, on the front side in the end mill rotation direction The located part first bites into the work material. Therefore, this part tends to be lost due to the impact of biting, but in the end mill of the present invention, the radius of curvature of the honing arc of the part on the front side in the end mill rotation direction of the cutting edge is maximized, and the rear side in the end mill rotation direction Since the radius of curvature of the arc of honing becomes smaller toward the end, it is possible to improve the fracture resistance of the most easily broken part and maintain the sharpness in the other part. Therefore, the generation of burrs can be prevented while extending the life of the cutting blade.
Further, honing may not be applied to the cutting edge at the rear end portion in the axial direction.

本発明に係るエンドミルによれば、切刃におけるホーニングの円弧の曲率半径を軸線方向で変化するように構成することによって、切刃の耐欠損性を向上させて長寿命化を図るとともに、切刃の切れ味を維持して被削材にバリが発生するのを防止し、良好な切削作業を行うことが可能となる。 According to the end mill according to the present invention, the radius of curvature of the honing arc in the cutting edge is configured to change in the axial direction, thereby improving the chipping resistance of the cutting edge and extending the life of the cutting edge. Therefore, it is possible to prevent the occurrence of burrs on the work material while maintaining the sharpness of the workpiece and to perform good cutting work.

以下、本発明の実施形態のエンドミルついて添付した図面を参照にして説明する。図1は本実施形態に係るエンドミルの側面図、図2は図1における切刃部の断面図、図3は図1におけるA‐A断面図の切刃付近の拡大図、図4は図1におけるB‐B断面図の切刃付近の拡大図、図5は図1におけるC‐C断面図の切刃付近の拡大図である。このエンドミルは、概略円柱状をなして軸線Oを中心に回転されるエンドミル本体1を有しており、エンドミル本体1の後端側(図1において右側)が工作機械の主軸端等に把持されるシャンク部2とされ、エンドミル本体1の先端側(図1において左側)が切刃部3とされている。   Hereinafter, an end mill according to an embodiment of the present invention will be described with reference to the accompanying drawings. 1 is a side view of the end mill according to the present embodiment, FIG. 2 is a cross-sectional view of the cutting edge portion in FIG. 1, FIG. 3 is an enlarged view of the vicinity of the cutting edge in the AA cross-sectional view in FIG. FIG. 5 is an enlarged view of the vicinity of the cutting edge of the BB cross-sectional view of FIG. 1, and FIG. 5 is an enlarged view of the vicinity of the cutting edge of the CC cross-sectional view of FIG. This end mill has an end mill body 1 that is formed in a substantially cylindrical shape and rotated about an axis O, and the rear end side (right side in FIG. 1) of the end mill body 1 is gripped by the spindle end of a machine tool or the like. The end side of the end mill body 1 (the left side in FIG. 1) is the cutting edge 3.

切刃部3の外周には、エンドミル本体1の先端側から後端側に向けて軸線O回りにエンドミル回転方向T後方側に一定の角度で捩れる複数条(本実施形態では4条)の切屑排出溝4が周方向に等間隔に形成されて、これらの切屑排出溝4のエンドミル回転方向T前方側を向く壁面と、エンドミル回転方向T後方側に連なる外周面との交差稜線部、すなわち前記壁面の外周側辺稜部に外周刃とされる切刃5が形成されている。   A plurality of strips (four strips in the present embodiment) are twisted around the axis O from the front end side to the rear end side of the end mill body 1 and twisted at a constant angle toward the rear side in the end mill rotation direction T. The chip discharge grooves 4 are formed at equal intervals in the circumferential direction, and the intersecting ridge line portion between the wall surface facing the front side in the end mill rotation direction T of the chip discharge grooves 4 and the outer peripheral surface connected to the rear side in the end mill rotation direction T, that is, A cutting edge 5 serving as an outer peripheral edge is formed on the outer peripheral side ridge portion of the wall surface.

即ち、エンドミル本体1の先端側から後端側に向けて軸線O回りにエンドミル回転方向T後方側に所定の角度で捩れる4つの切刃5が形成されている。これによって、切屑排出溝4のエンドミル回転方向T前方側を向く壁面がすくい面6とされ、この切屑排出溝4のエンドミル回転方向T後方側に連なる外周面が切刃5の逃げ面7とされる。ここで、すくい面6は、エンドミル回転方向T後方側に向けて凹んだ凹曲面状をなしており、切刃5には正のすくい角が与えられている。なお、この切刃5が軸線O回りになす回転軌跡の軸線Oに垂直な断面は、本実施形態においては軸線Oを中心とした円形とされている。   That is, four cutting edges 5 that are twisted at a predetermined angle around the axis O toward the rear side in the end mill rotation direction T are formed from the front end side to the rear end side of the end mill body 1. As a result, the wall surface of the chip discharge groove 4 facing the front side in the end mill rotation direction T serves as the rake face 6, and the outer peripheral surface of the chip discharge groove 4 connected to the rear side in the end mill rotation direction T serves as the flank 7 of the cutting blade 5. The Here, the rake face 6 has a concave curved shape that is recessed toward the rear side in the end mill rotation direction T, and the cutting edge 5 is given a positive rake angle. In addition, the cross section perpendicular | vertical to the axis line O of the rotation locus | trajectory which this cutting blade 5 makes around the axis line O is made into the circular shape centering on the axis line O in this embodiment.

一方、切刃部3の先端部には、切屑排出溝4から内周側に延びるギャッシュ8が形成されており、切屑排出溝4のエンドミル回転方向T前方側を向く壁面の先端側辺稜部には、前記切刃5の先端からエンドミル本体1径方向内側の軸線O近傍まで延びる底切刃9が形成されている。       On the other hand, a gash 8 extending from the chip discharge groove 4 to the inner peripheral side is formed at the tip of the cutting edge 3, and the tip side edge of the wall facing the front side in the end mill rotation direction T of the chip discharge groove 4. A bottom cutting edge 9 extending from the tip of the cutting edge 5 to the vicinity of the axis O on the radially inner side of the end mill body 1 is formed.

ここで、切刃5には、軸線Oに垂直な断面において該切刃5のすくい面6と逃げ面7との境界部が円弧状となるようにホーニングが施されており、本実施形態においてはこのホーニング量が軸線O方向で変化するように構成されている。具体的には、本実施形態においては、エンドミル本体1のエンドミル回転方向T前方側からエンドミル回転方向T後方側に向かうに従って、即ちエンドミル本体1の先端側から後端側に向かうに従って、切刃5のすくい面6と逃げ面7との境界部に位置する円弧の曲率半径が連続的に小さくなるようなホーニングが施されている。   Here, honing is applied to the cutting edge 5 so that a boundary portion between the rake face 6 and the flank face 7 of the cutting edge 5 has an arc shape in a cross section perpendicular to the axis O, in the present embodiment. The honing amount is configured to change in the direction of the axis O. Specifically, in this embodiment, the cutting edge 5 extends from the front side in the end mill rotation direction T toward the rear side in the end mill rotation direction T, that is, from the front end side to the rear end side of the end mill main body 1. Honing is performed so that the radius of curvature of the arc located at the boundary between the rake face 6 and the flank 7 is continuously reduced.

詳述すると、切刃部3の先端部の軸線Oに垂直な断面における切刃5を示す図3においては、切刃5の先端に大きくホーニングが施されることにより、すくい面6と逃げ面7との境界部には曲率半径の大きな円弧が形成されている。   More specifically, in FIG. 3 showing the cutting blade 5 in a cross section perpendicular to the axis O of the distal end portion of the cutting blade portion 3, the rake surface 6 and the flank surface are greatly honed to the distal end of the cutting blade 5. A circular arc having a large radius of curvature is formed at the boundary with 7.

また、切刃部3の軸線O方向中間部の断面における切刃5を示す図4においては、切刃部3の先端部に比べてホーニング量は小さくされており、すくい面6と逃げ面7との境界部に形成される円弧の曲率半径は、切刃部3の先端部に比べて小さくなっている。   Further, in FIG. 4 showing the cutting edge 5 in the cross section of the intermediate portion in the axis O direction of the cutting edge portion 3, the honing amount is made smaller than the tip end portion of the cutting edge portion 3, and the rake face 6 and the flank face 7. The radius of curvature of the circular arc formed at the boundary between and the cutting edge 3 is smaller than the tip of the cutting edge 3.

そして、切刃部3の後端部の軸線Oに垂直な断面における切刃5を示す図5においては、切刃5にはホーニングはほとんど施されておらず、すくい面6と逃げ面7とはその境界に円弧を形成することなく鋭角を構成しながら交わり、切刃5は鋭利なものとされている。   And in FIG. 5 which shows the cutting blade 5 in the cross section perpendicular | vertical to the axis O of the rear-end part of the cutting blade part 3, the honing is hardly given to the cutting blade 5, The rake face 6 and the flank 7 Are intersecting while forming an acute angle without forming an arc at the boundary, and the cutting edge 5 is sharp.

以上のような構成とされたエンドミルは、エンドミル本体1の後端に形成されたシャンク部2が工作機械の主軸端に把持されて、軸線O回りに回転されるとともに軸線Oに交差する方向に向けて送られて、被削材に溝を形成するような加工を施したりする。そして被削材の切屑は切屑排出溝4に沿って刃先部3の後端側に排出される。       In the end mill configured as described above, the shank portion 2 formed at the rear end of the end mill body 1 is gripped by the spindle end of the machine tool, rotated around the axis O, and in a direction intersecting the axis O. The workpiece is sent to the workpiece to be processed to form a groove. Then, chips of the work material are discharged to the rear end side of the blade edge portion 3 along the chip discharge groove 4.

ここで、切刃5のホーニング量が軸線O方向で変化するように構成した場合、切刃5のホーニング量が大きい箇所では耐欠損性が高くなる一方で、ホーニング量が小さい箇所では刃先の鋭利さが維持されて切れ味が高くなる。従って、切削状況に応じてエンドミルの切刃5のホーニング量を変化させるようにして、欠損し易い箇所においては切刃のホーニング量を増加させ、その他の箇所においてはホーニング量を減少させることによって、切刃5の寿命を延ばすとともに、切れ味を維持して被削材にバリが発生することを防止することが可能となる。   Here, when the honing amount of the cutting blade 5 is changed in the direction of the axis O, the chipping resistance is high at a portion where the honing amount of the cutting blade 5 is large, while the sharpness of the cutting edge is high at a portion where the honing amount is small. Is maintained and sharpness is increased. Therefore, by changing the honing amount of the cutting edge 5 of the end mill according to the cutting situation, by increasing the honing amount of the cutting edge in a portion where it is likely to be lost, and by decreasing the honing amount in other portions, While extending the lifetime of the cutting blade 5, it becomes possible to maintain a sharpness and to prevent generation | occurrence | production of a burr | flash in a work material.

本実施形態のエンドミルは、切刃5が先端側から後端側に向けて軸線O回りにエンドミル回転方向T後方側に螺旋状に捩れていることから、被削材に切削加工を施す際には、切刃5のうちエンドミル回転方向Tの最前方に位置する先端側の切刃5が最初に被削材に喰い付く。
よって、この喰い付きの衝撃によって先端側の切刃5は欠損し易くなるが、本実施形態のエンドミルにおいては、切刃5の先端部においては十分なホーニングが施されており、耐欠損性が高いものとされているため、切刃5が欠損等することを避けることができ、切刃5の長寿命化を図ることが可能となる。
In the end mill of the present embodiment, the cutting edge 5 is spirally twisted around the axis O from the front end side toward the rear end side in the end mill rotation direction T, and therefore when the workpiece is cut. In the cutting edge 5, the cutting edge 5 on the front end side located in the forefront in the end mill rotation direction T bites the work material first.
Therefore, the cutting edge 5 on the tip side is likely to be broken by this biting impact, but in the end mill of the present embodiment, the tip portion of the cutting blade 5 is sufficiently honed and has a chipping resistance. Since it is high, it is possible to avoid the cutting blade 5 from being broken and the like, and it is possible to extend the life of the cutting blade 5.

その一方で、切刃5のホーニング量が、エンドミル回転方向T前方側からエンドミル回転方向T後方側に向かうにつれて、即ちエンドミル本体1の先端側から後端側に向かうにつれて小さくされていることから、後端側ほど切刃5の切れ味が鋭くなっており、先端側では耐欠損性を高く維持しながら、切刃5の先端より後端側の部分では、バリを発生させることなく円滑に切削加工を行うことが可能となる。   On the other hand, the honing amount of the cutting edge 5 is reduced from the front end side in the end mill rotation direction T toward the rear side in the end mill rotation direction T, that is, from the front end side to the rear end side of the end mill main body 1. The sharpness of the cutting edge 5 is sharper toward the rear end side, and the cutting process is smoothly performed without generating burrs at the rear end side of the cutting edge 5 while maintaining high fracture resistance at the front end side. Can be performed.

以上のように、本実施形態に係るエンドミルによれば、切刃5におけるホーニング量を軸線方向で変化するように構成することによって、即ち、切刃5が先端側から後端側に向けて軸線O回りにエンドミル回転方向T後方側に螺旋状に捩れているエンドミルにおいて、切刃5のホーニング量をエンドミル回転方向T前方側からエンドミル回転方向T後方側に向かうに従って小さくなるように設定することによって、切刃5の耐欠損性を向上させてエンドミルの長寿命化を図ることができるとともに、切刃5の切れ味を維持して、被削材にバリが発生するのを防止し良好な切削作業を行うことが可能となる。   As described above, according to the end mill according to the present embodiment, the honing amount in the cutting blade 5 is configured to change in the axial direction, that is, the cutting blade 5 is axially directed from the front end side toward the rear end side. By setting the honing amount of the cutting edge 5 to be smaller from the front side in the end mill rotation direction T toward the rear side in the end mill rotation direction T in the end mill spirally twisted around the O in the end mill rotation direction T backward. In addition to improving the chipping resistance of the cutting edge 5 and extending the life of the end mill, the cutting edge 5 can be maintained in its sharpness to prevent burrs from being generated on the work material and to achieve good cutting work. Can be performed.

本発明の実施形態であるエンドミルの側面図である。It is a side view of the end mill which is an embodiment of the present invention. 図1における切刃部の断面図である。It is sectional drawing of the cutting blade part in FIG. 図1におけるA‐A断面図の切刃付近の拡大図である。FIG. 2 is an enlarged view of the vicinity of the cutting edge of the AA cross-sectional view in FIG. 1. 図1におけるB‐B断面図の切刃付近の拡大図である。FIG. 2 is an enlarged view of the vicinity of the cutting edge of the BB cross-sectional view in FIG. 1. 図1におけるC‐C断面図の切刃付近の拡大図である。It is an enlarged view of the cutting edge vicinity of CC sectional drawing in FIG.

符号の説明Explanation of symbols

1 エンドミル本体
4 切屑排出溝
5 切刃
O 軸線
T エンドミル回転方向
1 End mill body 4 Chip discharge groove 5 Cutting edge O Axis T End mill rotation direction

Claims (2)

軸線回りに回転されるエンドミル本体の先端部外周に、前記軸線回りに捩れた螺旋状の切屑排出溝が複数形成され、これらの切屑排出溝のエンドミル回転方向前方側を向く壁面の外周側辺稜部に切刃が形成されたソリッドタイプのエンドミルにおいて、
前記切刃に円弧状のホーニングが施され、
それぞれの前記切刃におけるホーニングの円弧の曲率半径が、軸線方向で変化しており、
前記切刃におけるホーニングの円弧の曲率半径が、エンドミル回転方向前方側からエンドミル回転方向後方側に向かって小さくなることを特徴としているエンドミル。
A plurality of spiral chip discharge grooves twisted around the axis are formed on the outer periphery of the end portion of the end mill body rotated about the axis, and the outer peripheral side ridges of the wall faces the front side in the end mill rotation direction of these chip discharge grooves In a solid type end mill with a cutting edge formed in the part,
Arc cutting is applied to the cutting blade,
The radius of curvature of the honing arc at each of the cutting edges varies in the axial direction;
An end mill characterized in that a radius of curvature of a honing arc in the cutting edge decreases from the front side in the end mill rotation direction toward the rear side in the end mill rotation direction.
前記軸線方向の後端部の切刃にはホーニングが施されていないことを特徴としている請求項1に記載のエンドミル。2. The end mill according to claim 1, wherein a honing is not applied to a cutting edge at a rear end portion in the axial direction.
JP2007214698A 2007-08-21 2007-08-21 End mill Active JP5194637B2 (en)

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KR1020107002096A KR101351128B1 (en) 2007-08-21 2008-08-12 End mill
CN200880103604.1A CN101784355B (en) 2007-08-21 2008-08-12 End mill
US12/672,921 US8690493B2 (en) 2007-08-21 2008-08-12 End mill
PCT/JP2008/064438 WO2009025197A1 (en) 2007-08-21 2008-08-12 End mill
EP08827621.7A EP2181787B1 (en) 2007-08-21 2008-08-12 End mill

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Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5287405B2 (en) * 2009-03-23 2013-09-11 三菱マテリアル株式会社 End mill
CN102009216A (en) * 2010-12-14 2011-04-13 株洲钻石切削刀具股份有限公司 End milling cutter for processing nonferrous metal
JP5906838B2 (en) * 2011-06-20 2016-04-20 三菱日立ツール株式会社 Square end mill
JP5895654B2 (en) * 2012-03-30 2016-03-30 三菱マテリアル株式会社 End mill
US20150258616A1 (en) * 2014-03-11 2015-09-17 Frank J Stanbach End mill
US10058934B2 (en) 2014-06-18 2018-08-28 Kyocera Sgs Precision Tools, Inc. Rotary cutting tool with honed edges
JP6253533B2 (en) * 2014-07-01 2017-12-27 株式会社神戸製鋼所 Cutting tool manufacturing method
DE102015116623A1 (en) * 2015-09-30 2017-03-30 Haimer Gmbh End mills
DE102015116624B4 (en) * 2015-09-30 2023-06-15 Haimer Gmbh end mill
JP6410220B1 (en) * 2017-07-27 2018-10-24 株式会社タンガロイ End mill
CN107433496A (en) * 2017-08-07 2017-12-05 广东鼎泰高科精工科技有限公司 A kind of forming method of profile milling cutter curved groove
CN112514651B (en) * 2020-08-17 2021-10-08 石河子大学 Spindle with profile modeling structure hook tooth for cotton picker
KR102571861B1 (en) * 2023-03-07 2023-08-29 현일근 Deburring tool

Family Cites Families (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2328629A (en) * 1940-07-29 1943-09-07 United Shoe Machinery Corp Drill
US2887136A (en) * 1957-09-19 1959-05-19 Republic Aviat Corp Router bit
US3003224A (en) * 1958-02-06 1961-10-10 Weldon Tool Co Cutting tool
US3078546A (en) * 1960-06-13 1963-02-26 Bruce E Kiernan Cutting tool
US4222690A (en) * 1977-12-03 1980-09-16 Ryosuke Hosoi Drill having cutting edges with the greatest curvature at the central portion thereof
CA1097899A (en) * 1979-01-05 1981-03-24 Alfonso Minicozzi Cutting tool
JPS6048211A (en) 1983-08-29 1985-03-15 Hitachi Choko Kk End mill with edge portion reinforced with coating
US5230593A (en) * 1987-12-14 1993-07-27 Mitsubishi Kinzoku Kabushiki Kaisha Twist drill
JP2980948B2 (en) 1990-06-06 1999-11-22 浜松ホトニクス株式会社 Light emitting device for spatial light transmission
US5049009A (en) * 1990-08-21 1991-09-17 The Weldon Tool Company Improved cutting tool
US5350261A (en) * 1992-03-12 1994-09-27 Mitsubishi Materials Corporation Twist drill
US5209612A (en) * 1992-03-27 1993-05-11 The Budd Company Cutting tool
JP3307681B2 (en) * 1992-07-14 2002-07-24 日進工具株式会社 End mill
JPH06315816A (en) * 1993-05-06 1994-11-15 Kobe Steel Ltd End mill
JPH07241715A (en) * 1993-06-25 1995-09-19 Matsuura Kikai Seisakusho:Kk End mill made of ceramics as raw material
US5609447A (en) * 1993-11-15 1997-03-11 Rogers Tool Works, Inc. Surface decarburization of a drill bit
JPH0929530A (en) * 1995-07-21 1997-02-04 Hitachi Tool Eng Ltd Roughing end mill
JPH09207007A (en) * 1996-01-31 1997-08-12 Mitsubishi Materials Corp Throw-away chip with honing
EP0798065A3 (en) * 1996-03-28 1998-03-11 Mitsubishi Materials Corporation Drill and throwaway tip
US6105467A (en) * 1998-06-26 2000-08-22 Baker; David A. Method for preparing a cutting edge on an end mill
JP2000052128A (en) 1998-08-03 2000-02-22 Hitachi Tool Engineering Ltd End mill with processed cutting edge and cutting edge processing method thereof
US6056485A (en) * 1998-09-01 2000-05-02 Kennametal Inc. Ramp plunge and feed milling cutter
JP2000296409A (en) * 1999-04-09 2000-10-24 Mitsubishi Materials Corp End mill
JP4465809B2 (en) * 1999-07-09 2010-05-26 三菱マテリアル株式会社 Throwaway tip
US6939090B1 (en) 1999-08-17 2005-09-06 Mitsubishi Materials Corporation Throwaway tip and throwaway-type cutting tool
JP4576723B2 (en) * 2000-05-30 2010-11-10 三菱マテリアル株式会社 Throw-away cutting tool
JP2002028884A (en) * 2000-07-13 2002-01-29 Fuji Heavy Ind Ltd Prepreg cutter blade
US6585460B1 (en) * 2000-11-13 2003-07-01 General Electric Company Drill having machine grindable cutting edge
US7001113B2 (en) * 2001-09-10 2006-02-21 Flynn Clifford M Variable helix cutting tools
US6846135B2 (en) * 2002-03-25 2005-01-25 Hitachi Tool Engineering Ltd. Radius end mill having radius edge enhanced in resistance to chipping and fracture
JP2005178326A (en) * 2003-12-24 2005-07-07 Miyanaga:Kk Drill bit
JP2006055965A (en) * 2004-08-23 2006-03-02 Osg Corp Cemented carbide drill causing low work hardening
US20060067797A1 (en) * 2004-09-28 2006-03-30 Calamia Guy A End mill
JP4059247B2 (en) * 2004-12-10 2008-03-12 日産自動車株式会社 Roughening method and cutting tool
WO2007046132A1 (en) * 2005-10-18 2007-04-26 Osg Corporation Ball end mill
US7544021B2 (en) * 2005-11-01 2009-06-09 Berkshire Precision Tool. Llc Rotary cutting tool with non-uniform distribution of chip-breaking features
US7563059B2 (en) * 2006-04-21 2009-07-21 Yg-1 Co., Ltd. Sinusoidal angled rotary cutting tool
US7950880B2 (en) * 2006-10-18 2011-05-31 Kennametal Inc. Spiral flute tap
US7588396B2 (en) * 2007-03-09 2009-09-15 Berkshire Precision Tool, Llc End mill
JP5266813B2 (en) * 2008-03-13 2013-08-21 三菱マテリアル株式会社 End mill
EP2258505A4 (en) * 2008-03-31 2012-01-04 Mitsubishi Materials Corp Radius end mill and cutting insert

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